Comparison of Methods for Suppressing Circulating Current in Metal Sheath of Cables Connected in Parallel

The number of high-voltage parallel cables is rapidly increasing. alternating magnetic field generated by the working current power cable cores induces voltage in adjacent metal sheath; if sheath and earth form a circuit, will create circulating current, resulting reduction load capacity life insulation. This paper uses MATLAB to construct model for calculating connected same phase, effects arrangement, phase sequence, loop distance on are investigated. induced sheaths decomposed into two components, i.e., component from core sheath. Two new connection methods proposed suppress current. Compared with traditional cross-connection grounding, can reduce coupling degree between loops, thus decreasing different grounding modeled environment an electromagnetic transient program (EMTP), simulated compared conventional method. In asymmetric series method at least 50%; however, its increases symmetric arrangement.